Ing works



A. L. MUNI-go l I 119" VIBRATORY'SCREEN, Re

, A 2 Sheets-Sheet l h Original Filed Sept. '7. 1928 INVENTOR.

lAHORA/Em.

A. L. MUNRO July 19, 1932. "mm" scm" Re. 18,530

ZSheelZs-Sheet 2 origina; Filed Sept'. '7, 1928 ATTORNEYS.

Reiasued Jul'y- 19, 1932 UNITED lSTATES PATENT lort-"Ict:

ALEXANDER L. MUNRO, F MILWAUKEE, WISCONSIN, ASSIGNO TO ENGINEER- INGWORKS, OF MILWAUKEE, WISCONSIN, A CORPORATION 0F WISCONSIN vmna'roazseaman Original N'o. 1,730,435, dated October 8, lg29, Serial No.

' reilue led April 25, 1931. j Seriall No. 532,966.

This invention relates to improvements in` vibratory screens, `moreparticularly, although not solely, adapted for screening crushed stone,gravel, etc.

Itis one of the objects ofthe present invention to provide .a vibratoryscreen in which the movements of two or more screens are balancedagainst each other to reduce the strain on the respective parts'.

A urtherob]l ect ofthe invention is to pro vide a vibratory screen inwhich the respective decks are vibrated by independent eccentrics inopposite relation to each other.

A further object of the invention is to provide a vibratory screen inwhich theend portions of the screens are yieldingly and pivotallysupported at thelr opposlte ends in a manner to perm't thebodilyimovement of the screens both vertically and horizontally.

A further object of the invention is toprovide a vibratory screen whichis of simple construction, is strong and-durable, and is well adaptedfor the purpose described.

With the -above and other objects in view,

the inventionl consists of the improved vibrating screen and its partsand combinations as set forth in the claims, and .all equivalentsthereof.

In the accompanying drawings in which the vsame reference charactersindicate the same parts in all of the views:

Fig. 1 is a top view of the improvedvibratory screen, parts being`broken away to show parts therebeneath; Y Y

Fig. 2 is a side view thereof, parts broken away;

Fig. 3 is an end view of the machine, parts broken away; L

Fig. 4 is a transverse vertical sectional detail view on a larger scaleand taken on line 44 of Fig. 2; and

Fig. 5 is a similar view of Fi 2. y r

Referring to the drawings, thel numeral 8 "-5 indicates afi-ame orsupport of rectangular taken on 4line 5-5 304,404, led September 7,1928. Application" for formation upon which are mounted central upperbearings end brackets 10. A main drive shaft 11 extending transverselyacross the frame Sais `journaled in the bearings 9 and at one of its endportions is provided with a pulley 12 for drivin Opposite end portionsof the shaft between' the bearings 9 have mounted fast thereonpairsof/eccentric sleeves 13 and 14 held in vposition by keys 15. Theeccentric sleeves of each pair are oiset, on the shaft. 11 diametricallyopposite each of the sleeves 14v abut against shoulders 11', while theouterends of the outer sleeves 13 abut against the bearingl 9.

Ball bearings 16 and 17 extend around the eccentric sleeves, and theinner bearings 17 have bearing sleeves 18 whichsurround theballlbearings 17 and are mounted beneath a central transverse member 19formingpart of the upper screen frame 20. Said frame is of rectangularform and is provided with removable screen sections 21. Transversely andlongitudinally extending angle bars 22 forming part'of the frame andupon which the screens rest serve and the screens.

The inner opposite side portions of the frame are provided with'removable inclined or curved guards 23 which are secured Iat theirupper edges to downwardly and portions of the screens to deflectthematerial to be screened directly upon the screens.

Portions of the inner ball bearing casings 24 extend inwardly towardseachother to're'- ceive-the opposite ends of' a tube 25 which protectsthe shaft 11.

extends around and The bore of the tube is of larger diameter than theshaft 11 to permit the eccentric movement of the ball casingand the tubewith relation to the'shaft. Said casings` 24 connection with. a -sourceof power.

to reinforce the frame the frame and extendinwardly over the side edgeA9 and lower front and rear other and the inner ends extend. on' oppositesides of the' bearing sleeves-18 and hold the screens. The

be formed of rubber, metal or other material, v

tion with relation to the other Links 33 connected to pivot bolts orpins parts in alined position. l Y

The outer ball bearings 16 are also provided with bearing sleeves 26which surround the ball bearings 16 and are mounted on a centraltransverse member 27 formingV part of the lower screen frame 28. Saidlower screen frame is also of rectangular form and is provided withremovable screen sections 2 9 whichmay be easily removed and screens ofa different mesh submitted. Transversely andlongitudinally extendingangle bars 30 forming part of the frame28 and upon which the screens 29rest, serve to reinforce the frame and the screensin providingintermediate supports for thescreens `between thev main members of theframe. The inner side portions of thelower frame are provided withremovable inclined or curved guards 31 which are secured at their upperedges to the side portions of the frame and extend downwardly andinwardly over the side edge portions of the lower screens to deflect -onthe lower screensl the material screened from the upper and coarser meshguard members 23 and 3l may nas desired.

The casings 32 surrounding the outer ball bearings extend on'oppositesides of thebearingvk sleeves 26 and hold said parts in posiparts.

34, which project through the front lower and rear brackets 10, extendupwardly on opposite sides of bothl ends of the screen frames and areadjustably connected together by transverse rods 35. The opposite endsof the rods are threaded to receive nuts 36 to secure the rods to thelinks and said links are each provided with a series of rod openings '37to vertically, adjust the position of said rods with relation to thelinks for reasons to be later described.

Bracketsd 38 pivotally mounted on the' transverse rods and bearingagainst the inner sides of the links 33 have upwardly and ydownwardlyprojectingy rod extensions 39 and 40, and theextensions 40are providedwith nuts41 on their lower ends. The rods 39 extend partly throughbearing brackets 42 mounted on the opposite side portions of screenframe 20, while the rods 40 extend downwardly through brackets 43mounted on the' opposite sides of the screen frame 28, and sleeves 33surrounding the rods 35l are interposed between, the brackets to holdsaid brackets in position. Coiled 'springs 44 surroundingthe respectiverod extensions'39 and 40 are interposed between the brackets 42 and 38and between the brackets 43 and the nuts 41, so that the forward andrearward end portions of the screen frame are yieldingly supported uponthe rod extensions 39 and 40 and said rods are pivotallyconnetd greasesupply to the links, and the links in turn are pivotally connected -tothe frame or support. The upper brackets 42 are provided with fittings39 for lubricating said rods 39. s thus connectedvr the screen framesare maintained and supported in rela- /nation of the screen frame todischarge the pieces of material too large to pass throu h lthe meshesof the screens by changing t e` transverse rod from one pair of openings37 in the links 33 to another pair.

In use the screen frames are adjusted to the desired inclination and thecentral shaft is 'rotated to vibrate the screens in diametricallyopposite directions throughout all'portions of their movements. As thusoperated f `the screen movements oppose or counterbalance each other andthus eliminate excessive wear of the parts. When rotated the material,crushed stone for instance, is fed onto the upper screen and the piecesof less l*size than the openings of the mesh will pass therethroughanddrop to the lower screen while the larger pieces will be discharged fromthe rear end.. of the upper screen andc taken care of in any mannerdesired. The screened stone dropped on the lower screen of smaller meshwill be'again screened and the smaller pieces will pass through thelower screen while vthe larger pieces will be discharged from the rearend, thus providing for separating the three sizes of stone or othervmaterial from each other. It will also be noted that the' true circularmovement of the screen members and the direction of rotation will causethe material resting on the screens to be advanced towards the dischargeend of thescreen and thus spread the material over the screen in workingit towards the discharge `end and thus permit the smaller pieces to dropthrough the meshes of the screen.

It is to be understood that other screen frames may be mounted on theextension rods to provide a vibrato screen. having a greater number ofscreenldecks if desired.

From the foregoing description it will be seen that the vibrator screenis. of very simpleconstruction and 1s well adapted for the purposedescribed'.

What I claim as my invention is:

1. A vibratory screen, comprising a, support, an upper and a. lowerscreen member positioned adjacent the support, a shaft jourvnaled on thesupport and having connections with the screen members forvibrating saidI members in opposite directions with relatlon to each other, meansyieldingly and pivotally connecting the screen members together andpivotally connecting the said members to the 4for pivotally support, andmeans for rotating the shaft.

2. A vibratory screen, comprising a. support, a transverse shaftjournaled thereon and having eccentrics extending in oppositedirections, an upper screen member journaled on one of the eccentrics, alower screen mem-v ber joui'naled on the other eccentric, meansconnecting the screen members together at one end portion and to thesupport, and means for rotating the shaft to vibrate the screen membersin opposite directions with relation to each other.

3. A vibratory screen, comprising alsuport, a transverse shaft journaledthereon and having spaced eccentrics, the eccentrics extending inopposite directions, an upper screen member j ournaled on one of theeccentrics, a lower screen member 'journaled on the other eccentric,means for pivotally connecting the screen members together at one endportion and to the support for maintaining the screen membersapproximately in parallel relation to each other, and means for rotatingthe shaft to vibrate the screen members in opposite directions withrelation to each other.

4. 'A vibratory screen, comprising -a support, a transverse shaftjournaled thereon and having spaced pairs of eccentrics, the eccentricsof each pair Vextending inopposite directions, an upperrectangular-shaped 'screen member journaled on oneof the likeeccentricsof each pair, a lower screen member journaled on the othereccentric of each pair of eccentrics, means for pivotally connecting thescreen members together at one end portion and to the support, and meansfor rotating the shaft to vibrate the screen members both verticallyandhorizontally in opposite directions with relation to each ot er.

5. A vibrating screen, comprising a support, a transverse shaftjournaled thereon and having spaced pairs of eccentrics, the eccentricsof each pair extending in opposite directions, an upper screen memberjournaled on one of the like eccentrics of each pair, a lower screenmember journaled on the other eccentric of each pair of eccentrics,links pivotally connected to the support and extending upl wardly onopposite sides of the screen members and adjacent end portions thereof,bracket members pivotally connected tothe links and provided withextensions having sliding connections with the screen members, yieldingmeans interposed between the connections and the extensions, meanspivotally and yieldingly connecting the opposite end portions of thescreen members together, and means for rotating the shaft.

6. A vibratory screen, comprising a support, a transverse shaftjournaled thereon and having-spaced airs of eccentrics, the eccentricsof each pair extending radially in lends of the screen members together,

ly. and downwardly alongside of the screen members, bearing bracketsmounted on the opposite sides of the screen members and slidablyengaging the extensions, coiled springs surrounding the extensions andinterposed between the upper bearing brackets and the rod brackets andbrackets and nutsmounted on the lower ends Aof the lower extension,bearing brackets mounted on the opposite side end portions of the screenframes adjacent the links, members having upwardly and downwardlyprojecting extensions which slidably through the bracket members toconnect the screen members together, springs on said extensionsandengaged by the bearing brackets, and means for rotating the'shaft.

7. A vibratory screen, comprising a support, a transverse shaftjournaledthereon,

spaced links pivotally connected to one end.

portion of the support, screen members positioned above and below theshaft and pivotalbetween the lower bearing bracket o extend ly andyieldingly connected to the links at one end portion, means yieldinglyand pivotally connecting the opposite ends of the screen memberstogether, spaced pairs of eccentrics mounted on the shaft, theeccentricsfof each pair extending radially in opposite directions,bearings connecting the screen members to the eccentrics in pairs tovibrate the screen members in opposite directions both vertically andhorizontally, and means for rotating the transverse shaft. f

8. A vibratory screen, comprising a support, a transverse shaftjournaled thereon, spaced links pivotally connectedA to one'end portionof the support, screen members posi- I tioned above and below the shaftand pivotally and yieldingly connected to the links at one end portion,said pivotal and yielding connection being 4adjustable to adjust theinclination of the screen members, means yieldingly and pivotallyconnecting the opposite spaced pairs of eccentrics mounted on ,theshaft, the eccentrics of each pair extendingv radially lOl in oppositedirections, bearingsconnecting thereof to vibrate the coacting with saidscreen members mid-way between the ends thereof to vibrate the same inopposite directions relative to' each other, means for rotating saidshaft, and yielding means coacting with said screen members on oppositesides of and remote from said shaft.

10. A vibratory screen comprising, a support, upper'and lowerscreenmembers osi-- tioned adjacent said support, a shaft journaled on saidsupport and connected to said screen members mid-way between the endssame in opposite directions relative to each portions of said screenmembers remote Afrom said shaft to said support, and yielding meansscreen members adjacen said pivotal connect-ing means. f

11. A vibratory4 screen comprising, a support, upper and lower screenmembers positioned adjacent said support, a shaft journaled on saidsupport and connected to medial portions of said screen members to saidmembers in opposite directions to each other and to balance the weighttl1ere of upon said shaft, means for rotating said shaft, and yieldingmeans coacting with end portions of said screen members. I

12. A vibratory screen comprising, a support, upper and lower screenkmembers posi- ".tioned adjacent said support, a shaft jouring saidshaft;

naled on said support and connected to said screenmembers mid-waybetween the ends thereof to vibrate the same in opposite directionsrelative to each other, means for rotating said shaft, means pivotallyconnecting said screen members to from said shaft, and yielding meanscoacting with said screen members on opposite sides of said shaft. i

13. A vibratory screen comprising, a. support, upper and lower screenmembers positioned adjacent said support, a shaft journaled on saidsupport and connected to said screen members mid-way between the endsthereof to vibrate the same in opposite directions relative to eachother, means for rotatmeans pivotally connecting said. screen members tosaid support remote from said shaft, and other means yieldingly engagingsaid screen members remote from said shaft. j

14. A vibratory screen comprising, a support, upper and lower screenmembers positioned adjacent said support, 'a shaft journaled onsaidsupport and connected to said f screen members mid-way between theends thereof to vibrate the tions relative to each screen membersrelative to said support.

15. A vibratory screen comprising, a sup- "port, upper and lower screenmembers posiother, means, for rotating said shaft, means pivotallyconnecting ing said shaft, means pivotally connecting r sald screenmembers to said support remote from said shaft, and means for varyingthe angularly of said screen members relative to said support.

In testimony whereof, I ax my signature. ALEXANDERv L. MUNRO.

vibrate f relative as Y said support remote same in opposite direcother,means for rotat,

ing Said shaft, yielding means coacting with .j said screen membersremote from said shaft, and means for varying the angularity of said

